51、concentrate,focus都有"集中"的意思。
concentrate [ˈkɔnsəntreit] v.集中，集中精力(后接on，宾语可以是具体或抽象的东西)；浓缩，压缩。
During exams, students concentrate hard on answering the questions.
focus [ˈfəukəs] v.集中(于某事物)；将(注意力等)集中于……(后接on，宾语一般不是具体的东西)。
Please focus your minds on the following problem.
52、confinement,limitation, restraint"限制，局限"
confinement [kənˈfainmənt] n.限制，囚禁(于某地或某种境地)。
The prisoner was sentenced to three months' solitary confinement.
limitation [ˌlimiˈteiʃən] n.限制，局限；(能力的)缺点，弱点。
That employee has limitations on what work he can do.
restraint [risˈtreint] n.克制，抑制；约束措施。
Even though the mother was very angry, she acted with restraint and didn't yell at her child.
53、considerable,considerate这是一对形近易混的形容词。
considerable [kənˈsidərəbl] a.相当大的，相当多的；值得考虑的。
That family owns a considerable amount of land.
considerate [kənˈsidərit] a.考虑周到的，体贴的，后面常跟of结构。
He is always considerate of others; he is kind and sympathetic.
54、conserve,preserve, reserve都有"保存"的意思。
conserve [kənˈsə:v] v.保存，保藏，保护(强调节约)。
In winter, some people conserve energy by lowing the heat at night.
preserve [priˈzə:v] v.保护；维持；保养；防止(食物)腐败(使不受破坏)。
The government preserves the rights of the individual person.
reserve [riˈzə:v] v.保留，储备(强调为某一特殊目的)；订(座位)，预定。
We are reserving these seats for my parents.
55、continual,continuous, constant, incessant
这一组形容词都有"不断的，不停的"的意思。
continual [kɔnˈtinjuəl] a.连续不断的；频繁的。表示时断时续的发生。
That dog's barking is a continual annoyance.
continuous [kənˈtinjuəs] a.不停的，连续不断的，强调中间不停顿。
Our homes and offices need a continuous supply of electricity.
constant [ˈkɔnstənt] a.不断的，经常的，强调始终如一地经常出现。
Everything in the universe is in constant motion.
incessant [inˈsesnt] a.不停的，持续不断的，强调令人厌烦地重复出现，中间有可能有停顿。
Incessant noise makes me appreciate silence.
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